I agree that it doesn't always mean violence, but the way this is shaping up, it's going to devolve into a race war.
What's more, I thnk it could happen on or soon after the May Day marches that the Communist supporters of the illegals are planning for them.
It won't come from the government protecting us against the invasion. It would come from the (most likely) few Americans who are fed up. And guess who'd be the first to be attacked and arrested by the National Guard when they're called out? American citizens.